I have a prxtool for windows that downloadded here. It could work on any other prx files except which was placed in flash0:/kd or kn directories.
What can i do to disasm these files?
First, you need to use PrxDecrypt 1.7 to decrypt $ony prx files.
Second, you need a recent version of prxtool to disasm it.
The win32 version of prxtool in the download section of ps2dev won't work.